I have an Ibanez SRX (my first bass) which is currently getting defretted. I love the feel of the instrument and, depending upon the quality of the defret, I plan to replace the pickups. Bartolinis and EMG's are obvious options, as they are active, possible direct drop in replacements. Although both brands interest me, I have a thing for single coil/passive tone and am curious if any soapbar/single coil/passive pickups exist as a direct drop in. I understand that preamp replacement may be required but I'll figure that out later. So, what are my options and what is the best choice?